钢筋混凝土高墩多水准抗震性能试验

发布时间：2018-03-24 08:41

本文选题：钢筋混凝土(RC)　切入点：高墩　出处：《同济大学学报(自然科学版)》2015年09期

【摘要】：对4个钢筋混凝土箱形高墩模型开展了拟静力试验研究,并重点研究结构在不同损伤状态下的性能及相应的变形指标.采用夹式引伸计监测了裂缝开展全过程,指出采用卸载至位移零点时的裂缝宽度会严重低估结构的残余裂缝损伤,同时允许震后结构产生不需要修复的残余裂缝比完全基于弹性响应可以多出10%~30%的强度折减空间.试验中还观测了混凝土压溃、严重剥落等损伤,并基于美国太平洋地震工程中心(PEER)数据库等相关试验结果进行了对比验证,结果表明发生混凝土压溃时的各样本墩顶偏移率分布较为集中,约为2.39%,试验结果与样本统计结果符合较好.各试件的最终破坏均表现为纵筋断裂,分别采用Priestley和Berry的等效塑性铰长度计算公式进行了对比,结果表明Berry公式对高墩极限位移的符合性相对较好.
[Abstract]:The pseudostatic test of four reinforced concrete box high pier models was carried out, and the performance of the structure under different damage conditions and the corresponding deformation indexes were studied. The whole process of crack development was monitored by means of a clamping extensometer. It is pointed out that the crack width when unloading to the zero of displacement will seriously underestimate the residual crack damage of the structure. At the same time, the residual cracks that do not need to be repaired in the post-earthquake structure are allowed to produce 10% more room for strength reduction than are completely based on the elastic response. Damage such as concrete crashing, severe spalling and so on have been observed during the test. The results are compared and verified based on the PEER-database of the Pacific Seismic Engineering Center of the United States. The results show that the migration rate distribution of each sample pier is concentrated when the concrete collapses occur. The test results agree well with the statistical results of the sample. The ultimate failure of each specimen is longitudinal bar fracture. The equivalent plastic hinge length formula of Priestley and Berry is used to calculate the length of the equivalent plastic hinge. The results show that the Berry formula has better conformance to the limit displacement of high pier.
【作者单位】：同济大学土木防灾国家重点实验室;
【基金】：国家“九七三”重点基础研究发展规划(2013CB036302) 国家自然科学基金(51378384) 中央高校基本科研业务费专项资金(20113184)
【分类号】：U442.55

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